C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 75baffd5e1377e6f…

MALICIOUS

PDF

651.6 KB Created: 2011-06-22 16:49:40 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: 51d1719c5042d5b2588d3180d2b43f84 SHA-1: e3cf876d5c58bfefae8fdd666b1c2f9f97b6f35e SHA-256: 75baffd5e1377e6f4ae42eb32ef9871ad8ecd557c3bd829e483219fb04428566
100 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for the CVE-2008-2551 exploit, which is known to download and execute payloads. The embedded URL http://artisanballoonz.com/system/system.exe likely hosts the second-stage malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9526

Heuristics 3

  • C6 Messenger DownloaderActiveX exploit critical CVE exact CVE_2008_2551
    PDF stream bytes contain HTML/ActiveX content configuring the vulnerable C6 Messenger DownloaderActiveX control with propDownloadUrl and propPostDownloadAction=run. This is the published exploit shape for CVE-2008-2551.
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://artisanballoonz.com/system/system.exe
    • http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000111a.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x111A 73272 bytes

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